Simultaneous voltammetric determination of dopamine and ascorbic acid using multivariate calibration methodology performed on a carbon paste electrode modified by a mer-[RuCl3(dppb)(4-pic)] complex

Journal of the Brazilian Chemical Society

Poliana M. Santos¹  Bianca Sandrino¹  Tiago F. Moreira¹  Karen Wohnrath¹  Noemi Nagata¹  Christiana A. Pessoa¹ 

[1] ,Universidade Estadual de Ponta Grossa Departmento de Química Ponta Grossa PR ,Brazil

关键词: carbon paste electrodes;    ruthenium complexes;    dopamine;    ascorbic acid;    multivariate calibration methodology;   

DOI  :  10.1590/S0103-50532007000100010

来源: SciELO

【 摘 要 】

The preparation and electrochemical characterization of a carbon paste electrode (CPE) modified with mer-[Ru0Cl3(dppb)(4-pic)] (dppb=Ph2P(CH2)4PPh2, 4-pic=CH3C5H4N), referred to as Rupic, were investigated. The CPE/Rupic system displayed only one pair of redox peaks, with a midpoint potential at 0.28 V vs. Ag/AgCl, which were ascribed to RuIII/RuII charge transfer. This modified electrode presented the property of electrocatalysing the oxidation of dopamine (DA) and ascorbic acid (AA) at 0.35 V and 0.30 V vs. Ag/AgCl, respectively. Because the oxidation for both AA and DA practically occurred at the same potential, distinguishing between them was difficult with cyclic voltammetry. This limitation was overcome using Partial Least Square Regression (PLSR), which allowed us, with the optimised models, to determine four synthetic samples with prediction errors (RMSEP) of 5.55´10-5 mol L-1 and 7.48´10-6 mol L-1 for DA and AA, respectively.

【 授权许可】

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